The hydrogen storage performance and catalytic mechanism of the MgH2 -MoS2 composite

In this work, we synthesized MoS 2 catalyst via one-step hydrothermal method, and systematically investigated the catalytic effect of MoS 2 on the hydrogen storage properties of MgH 2 . The MgH 2 -5MoS 2 composite milled for 5 h starts to release hydrogen at 259 & DEG;C. Furthermore, it can desorb 4.0 wt.% hydrogen within 20 min at 280 & DEG;C, and absorb 4.5 wt.% hydrogen within 5 min at 200 & DEG;C. Mo and MoS 2 coexisted in the ball milled sample, whereas only Mo was kept in the sample after dehydrogenation and rehydrogenation, which greatly weakens the Mg-H bonds and facilitates the dissociation of MgH 2 on the surface of Mo (110). The comparative study show that the formed MgS has no catalytic effect for MgH 2 . We believed that the evolution and the catalytic mechanism of MoS 2 will provide the theoretical guidance for the application of metal sulfide in hydrogen storage materials. & COPY; 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University